1960s-1970s ATMs so primitive was the lack of computer systems that were
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What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
"I was struggling to breathe. I was really, really sick... I was petrified."